title: Overview and future directions.
authors.affiliation: Division of Respiratory and Critical Care, Physiology and Medicine, Harbor-UCLA Medical Center, Torrance 90509.
authors.forename: K
authors.initials: K
authors.lastname: Wasserman
mesh_terms: D015308:Anaerobic Threshold / Q000502:physiology*; D005080:Exercise Test; D006333:Heart Failure / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D011659:Pulmonary Gas Exchange / Q000502:physiology*